Ribbon spool



J55. DUNCAN 'ET AL RIBBON SPOOL Filed Aug. 26, 19:25'

Patented Aug. 16, 1927.

UNITED STATES JOSEPH S. DUNCAN AND HENRY HUBBARD, OF CHICAGO, ILLINOIS,ASSIGNOIRS TO ADDBESSOGBAPH COMPANY, OF CHICAGO, ILLINOIS, A CORPORATIONOF ILLINOIS.

RIBBON SPOOL.

Application filed Augult 26, 1925. Serial No. 52,508.

This invention relates to ink ribbon spools for use in connection withthe ribbon mechanism of our companion application Serial No. 52,504,filed concurrently herewith, or

other ribbon mechanisms for which itjis or may be adapted.

The object of the invention is to provide a ribbon spool of simpleconstruction adapt-v ed to cooperate with mechanism for insurlo ingreversal of operation of the ribbon and having means for fastening thevribbon securely to the spool and'also acting as a driving element forcooperating with a driver to revolve the spool. 7 15. The invention alsohas for its object to provide a simple method of manufacturing a spoolof this character and for securing the ribbon thereto so that the ribboncannot be replaced'to use the spool again after the original ribbon hasbeen worn out.

Referring to the drawings, Figure 1 is a perspective view of a spoolembodying the invention, showing a ribbon attached thereto.

2 Fig. 2 is an elevation of the driver which is more particularlydescribed in our companion application referred to.

Fig. 3 shows the blank from which the spool is made, and I 3 Fig.4'shows the same blank provided with the engaging prongs.

' Figs. 5, 6, 7 and 8 show progressive steps in forming the spool andsecuring the ribbon therein.

: Fig. 9 is. a plan view of the spool shown in Fi 8. v

Fig. 10 is an enlarged detail sectional view of a portion of a spool.

Fig. 11 shows one'of the tools for forming 4o 3. prong.

Fig. 12 is a sectional view showing the spool on a bed and preparatoryto punching the prongs. v

Fig. 13 is a sectional view on line 1313 of Fig. 12.

Fig. 14 is a sectional view showing the manner in which the openings arepunched in the spool to secure theoverlapping margins of the spool uponthe ribbon.

Referring to the drawings the spool 15 is made in cylindrical form ofthin sheet metal from a blank 16, which is provided with a plurality ofslots 17 to receive the reversin tripper of the ribbon mechanism, as

more y set forth in our companion apspool.

plication. In the embodiment of the invention illustrated here and inour companion application the tripper comprises three rollers (notshown) which are adapted to ride upon the ribbon Wound spool until theribbon is unwound therefrom, whereupon the rollers enter the slots 17thereby tripping the mechanism to eflect reversal of travel of theribbon. 1

The spool blank is provided with a pluralit of small prongs 18 along onemargina edge and these prongs are formed by the pointed ends 19 of aplurality of punches 20, Figs. 11, 13. The blank is arranged upon a bed21 having a groove 22 between gauges 23 and a shoulder 24 and thepunches 13 are driven down u on the blank to punch out the prongs into te groove 22.

The blank is then bent into cylindrical form, as shown in Fig. 5, withthe margin 24 having the prongs l8 underl ing the margin 25, and theribbon 26 is fol ed over upon itself at its end and a tool 27 is engagedwith the fold to push the ribbon in between the overlapping margins,after which the tool can be withdrawn without pulling out the ribbon,which becomes engaged with the prongs 18.

Then thespool is placed upon a mandrel 28 and the openings 29 arepunched therein, the material punched out forming projections 30, Fig.10, which extend into the spool and are arranged in alignment lengthwiwthereof. These openings 29 and the projections 30 are formed by alurality of punches 31 which are driven t rough the overlapping margins24, 25 and the interposed ribbon, there being a groove 32 in the mandrelto receive the ends of the punches and the ends of the projections 30,Fig. 14. The punches have curved faces 31' which cause the projections30 to curve inwardly and away from each other in a hook-like It isdesirable that provision should be made for insurin that the spoolswilialways be arranged properly on the driver and for that purpose weprovide the spool with projections 35 at one end toengage a recess 36 inthe driver. It will readily be understood that this arrangement permitsthe spool to be arranged on the driver right end to but prevents thespool being arranged on the driver Wrong end to, since the groove 32 inthe driver is not of sufiicient width to accommodate the projection 35.

This invention provides a spool as an article of manufacture which isadapted to cooperate with a. tripper for reversing the travel of theribbon, and it also provides a spool of simple construction, with theoverlapping margins rigidly interlocked upon the interposed ribbon, tosecurely fasten the ribbon to the spool and with projections extendinginwardly of the spool to interengage with a driver, whereby the spoolisrevolved. The invention is simple in construction, easy to-manufactureand assemble, and the ribbon is permanently engaged with the spool sothat it cannot be removed and replaced.

We reserve the right to make all changes in the details of constructionas fairly fall within the scope of the following claims.

We claim:

1. An ink ribbon spool formed from a blank of sheet metal having itsside margins overlapped, the under margin having prongs struck uptherefrom to receive and hold the end of the ribbon'when it is insertedbetween the margins, the upper margin being nonperforate.

2. A ribbon spool formed from ablank of sheet metal having its sidemargins overlapped, there being openings punched in one of said marginsand the metal struck up thereby forming prongs, the opposite marginbeing imperforate.

3. An ink ribbon spool formed from a blank of sheet metal having itsside-margins overlapped, a ribbon received there-between, and punchpricks securing said margins and interposed ribbon together.

4. An ink ribbon spool formed from a blank of sheet metal having itsside margins overlapped, there being openings punched in the undermargin and the metal struck up thereby forming prongs, a ribbon receivedbetween said margins and held by said prongs, and punch pricks securingthe margins and interposed ribbon together.

5. A ribbon spool formed from a blank of sheet metal having its sidemargins overlapped, there being openings punched in the under margin andthe metal struck up thereby forming prongs, a ribbon received betweensaid margins and held by said prongs, and punch pricks securing themargins and interposed ribbon together.

6. An ink ribbon spool formed from a blank of sheet metal having itsside margins overlapped to receive the ribbon therebetween, openingsbeing punched through said margins and interposed ribbon, and the metalforced out to form said openings projecting inwardly of the spool.

7. An ink ribbon spool formed from a blank of sheet metal having itsside margins overlapped toreceive the end of the ribbon therebetween,and projections punched inward from the overlapped margins andinterposed ribbon and extending within the spool in alignment lengthwisethereof.

8. An ink ribbon spool formed from a blank of sheet metal having itsside margins overlapped to receive the end of the ribbon therebetween,and hook-shaped projections stamped from the overlapped margins andinterposed ribbon and extending inward of the spool.

JOSEPH s. DUNCAN. HENRY E. HUBBARD.

I -1' Ind

